New update:
Merlin's fins looked fine today. His coloring is a little off around his face, working on making that better. Not too bad now. I actually did tank changes today, I put Merlin in his ten gallon tank all by himself again. And put Aqua back in the one gallon. Merlin seems alot happier today. =D
So now I'm in a good mood. Everyone seems fine. Fishy still has a hole in his fin, but I'm doing salt water and changes, so he should be good eventually. So now I have 4 happy fishies! yay!

Yup, he's eating and swimming around. he's even trying to flare at blue, even though he's in another tank. It looks like he lost a scale, and I'm treating him with aquarium salt. He get's one more dose of the erythromycin tomorrow. But other than that, he's great!

Another update on Merlin and everyone:
Merlin is doing awesome. I put the rest of the erythromycin in today. Was kinda cute because Merlin started chasing it and tried to eat it, till he realized it wasn't food. lol. But he let me get a few pics of him today, yay.
I decided when I saw Fishy's fins not getting better, starting to get transclusent, or whatever it is when you can see through them... So I put him in the one gallon vase originally bought for him. Because I guess that aquarium salt water is good. I'm doing the one teaspoon of aquarium salt in one gallon, changing 100% daily. So hopefully I see some fin improvement. His fins are getting really long and beautiful btw, try to get some pics later.
Blue and Aqua are great, nothing wrong with them. =D

Well not much to update on, lol. I used the rest of the erythromycin a few days ago, used the rest of those tabs today. He looks great. He's got a bubblenest going. He's super active, let me get a few pics of him yesterday. I'm so happy he's better. He's got some white stuff still on one part of a fin, but hopefully it'll be okay in a few days, just keeping an eye on that. I still have Fishy in the gallon vase, changing his water every afternoon around 12. He doesn't like being taken out of his home every day...
Moved Aqua's tank up with the boys, I'll put pics up Saturday. She seemed stressed, her stripes went away and her gills looked weird. Looks like she needs a new airstone. And as soon as I put her up next to the boys, her stripes came back. I really want to get that heater that only makes the water go up a few degrees and put her in that 3 gallon bowl I was using. I feel she needs a bigger home, even though shes so tiny.
Anywho, done blabbing, lol.